40006331 has 4 divisors (see below), whose sum is σ = 40022664. Its totient is φ = 39990000.

The previous prime is 40006319. The next prime is 40006339. The reversal of 40006331 is 13360004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40006331 - 2²² = 35812027 is a prime.

It is a super-2 number, since 2×40006331² = 3201013040163122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40006339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3665 + ... + 9666.

It is an arithmetic number, because the mean of its divisors is an integer number (10005666).

Almost surely, 2^40006331 is an apocalyptic number.

40006331 is a deficient number, since it is larger than the sum of its proper divisors (16333).

40006331 is a wasteful number, since it uses less digits than its factorization.

40006331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16332.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 40006331 is about 6325.0558100305. The cubic root of 40006331 is about 342.0132314797.

Adding to 40006331 its reverse (13360004), we get a palindrome (53366335).

The spelling of 40006331 in words is "forty million, six thousand, three hundred thirty-one".